lgLoader

1.Try to use F12 everywhere except on apptication windows. You will see the magic!2.When you put cursor on the lookingGlass button,you can use enter, space, or down keys to open lookingGlass, and Esc and F12 to close lookingGlass!3.right-click lookingGlass button to restart gnome-shell
read README.md file in ~/.local/share/gnome-shell/extensions/lgLoader@zhw2101024 for more